| Abstract Scope |
This study reported the fabrication of bimetallic structures (BS) from tungsten alloy (90WNiFe) and high performance alloys, such as nickel alloy (In625) via wire-arc directed energy deposition (DED)-based additive manufacturing (AM). Microstructures and mechanical properties of 90WNiFe/In625 BS were investigated for three different heat input conditions adapted by three distinct levels of welding current: low (180A), medium (200A), and high (220A). The interfacial microstructure of fabricated BS exhibited no welding defects, including cracks and porosities. The highest average ultimate tensile strength of 618 MPa was achieved in the low heat input condition, with an average elongation of 49%. The bonding strength is attributed to the diffusion of chromium, nickel, molybdenum, and niobium from In625 into the γ-(Ni, Fe, W) binding matrix of the 90WNiFe substrate. |